Those of you out there (and I know there are quite a few of you) using the OS 1.20 pumped engine in the GP Ryan please advise me of any gotcha's or things to look out for. I've tried to do a search in the archives but perhaps this post will jog a few memories or bring up things I might have missed.

FWIW I'm planning on using a 15x8 prop and the fuel tank that comes with the plane as well as the stock spinner.


looking forward to hearing from you guys....

Jeff

I flew mine using a master airscrew 16x6. Took off on 1/3 throttel. I have yet to find a practical reliable way to route the exhaust out of the lower middle portion of the cowl that will stand up to heat and vibration. speaking of overheating, no problems there. I used onboard battery for glow power to maintain idle otherwise it would load up and quit without. Only expect 10 to 12 min. of flight with supplied tank. that pump is thirsty. spend a little extra and buy a good aluminum spinner like the MAXX products 2 3/4". I used the supplied spinner and on the second flight the spinner blew up like a hand grenade when the engine backfired due to a slightly rich mixture. quite comical to watch however.

We have one flying in the club. Everything is stock including the 1.20 surpass III. Flys and opperates perfectly. Enjoy the aeroplane.

I 've had mine for several months , I am not a proponent
of ARF's but the Ryan was too much to resist.

I have posted several threads about this ARF . Some good,
many not so good. The basics are all there but I either had to,
or elected to,revise a few things.

1 The tank is way to high for a non pump application. Why they
did this I'll never know.Not everyone may have a pump engine
( don't)

2. The wells for the "wing joiners"arn't sealed too well. when
you go to put the wing together all the epoxy that you pour in
may just run into the wing and not stay where it's supposed to.
(this is also the case in my 1/3 Pitts, I wonder how many people
have much less epoxy in the center section than they realize)

3 The hard points in the ailerons were not close enough to
the LE to allow the supplied horns to work

4 The mounting of the tail wheel is poorly done but can
be overcome with a little effort

5 replace the spinner. some complain about the wheels but
I haven't and I don't have any problems there.

there were several other things that I wasn't happy with
but these changes were my doing ,not fault with the plane.


All and all it's darn good flying craft and at this point , seems
to have been worth the effort.

Arf's have come a long way.........but still have a distance
to go.

On to my Stinson SR-9(nice kit)

Regards
Roby

OK after three months I finely was able to put a couple of flights on the Ryan STA-M this week end and I really like it. After speaking to a fellow member at our club which has the sport version he is packing a bit more weight up front in the wing compartment then I am and he told me that his CG was just about right so I did a similar setup but a bit less weight. The difference is that he has two 6 volt battery packs and an on board glow system. I am using two 4.8 volt packs with a remote system. I did not bother actually CGing the plane but it flies straight and level with hands free but it seems to me that it wants to land like a nose heavy plane, maybe thats just its character. Can someone enlighten me on this.

Also after propping a 15X8 prop on the OS 120 FS I found that it was still a bit over propped so I bumped it down to a 15X6. Now heres what I can't figure is that my Satio 100 is turning the same prop go figure, I guess theres not really that much difference between the two.

Randy

Randy,
I put my cg "dead on" as recommended per the instructions
and my STA flies perfectly. It may be slightly nose heavy but
not very much.Or at least to the point that I feel the need
to move it back.

For what little time it takes,and at no cost, check your
cg, this way at least you'll where it's located and won't
have to guess at it.


Regards
Roby

I have OS 120 III with pump. Used 90 degree header with flex pipe to put outlet out the bottom. All else is stock. About 30 flights with no problems. Reinforce the wheel pants inside with some glass cloth, throw away the mickey mouse tires that come with it and put 1/2 inch larger real tires on it. All else is great. Flys like a low wing cub with plenty of power.

Enjoy.
BobHH